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Auto merge of #5767 - glennw:image-cache, r=larsbergstrom,jdm
* Simpler image cache API for clients to use. * Significantly fewer threads. * One thread for image cache task (multiplexes commands, decoder threads and async resource requests). * 4 threads for decoder worker tasks. * Removed ReflowEvent hacks in script and layout tasks. * Image elements pass a Trusted<T> to image cache, which is used to dirty nodes via script task. Previous use of Untrusted addresses was unsafe. * Image requests such as background-image on layout / paint threads trigger repaint only rather than full reflow. * Add reflow batching for when multiple images load quickly. * Reduces the number of paints loading wikipedia from ~95 to ~35. * Reasonably simple to add proper prefetch support in a follow up PR. * Async loaded images always construct Image fragments now, instead of generic. * Image fragments support the image not being present. * Simpler implementation of synchronous image loading for reftests. * Removed image holder. * image.onload support. * image NaturalWidth and NaturalHeight support. * Updated WPT expectations. <!-- Reviewable:start --> [<img src="https://reviewable.io/review_button.png" height=40 alt="Review on Reviewable"/>](https://reviewable.io/reviews/servo/servo/5767) <!-- Reviewable:end -->
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33 changed files with 2785 additions and 1679 deletions
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@ -21,7 +21,7 @@ use msg::constellation_msg::{Key, KeyState, KeyModifiers, LoadData};
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use msg::constellation_msg::{SubpageId, WindowSizeData};
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use msg::constellation_msg::{self, ConstellationChan, Failure};
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use net_traits::{self, ResourceTask};
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use net_traits::image_cache_task::{ImageCacheTask, ImageCacheTaskClient};
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use net_traits::image_cache_task::ImageCacheTask;
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use net_traits::storage_task::{StorageTask, StorageTaskMsg};
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use profile::mem;
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use profile::time;
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